sneak nut
When you sneak a nut out of your pants to surprise a friend!
Tom whips his left nut out and calls Billy's name! Tom: LOL SNEAK NUT
Sneak nuts
When you're taking a photo and you slightly pull your sack out so that its inconspicuous in the moment but forever enshrined in the picture.
Hey remember that picture we took on Christmas 2 years ago, there was some sneak nuts in it.